Considering Agatha used the word 'Chaos magic' then it means Wanda is much more powerful than any Sorcerer supreme, i.e. Doctor Strange. She has the ability to change every fabric of reality to her whim. She probably didn't know she had that power. In the comics, Wanda was born at the place where an elder god with that magic was sealed. Newborn Wanda was touched by the hand of that god somehow which gave her that power. And Agatha is supposed to help her control it. Let's see what this Agatha wants. This is really amazing. Also, this episode has trashed a lot of theories and speculations about Mephisto, etc. For now, only Agatha is the bad guy or is she?